|Name|Position|Birth Date/Age at start of campaign|Games in campaign|Club|
|---|---|---|---|---|
|Erich Burgener|GK|February 15, 1951 (age 31)|3|Servette|
|Roger Berbig|GK|November 6, 1954 (age 27)|3|Grasshoppers|
|Charly In-Albon|DF|June 23, 1957 (age 25)|4|Grasshoppers|
|Heinz Lüdi|DF|October 8, 1958 (age 23)|4|FC Zürich|
|Beat Rietmann|DF|October 24, 1961 (age 20)|2|FC St. Gallen|
|Andy Egli|DF|May 8, 1958 (age 24)|6|Grasshoppers|
|Alain Geiger|DF|November 5, 1960 (age 21)|4|Servette|
|Marco Schällibaum|DF|April 6, 1962 (age 20)|1|Grasshoppers|
|Marcel Koller|DF|November 11, 1960 (age 21)|2 (both as sub)|Grasshoppers|
|René Botteron|MF|October 17, 1954 (age 27)|1|1. FC Nuremberg  FC Basel|
|Heinz Hermann|MF|March 28, 1958 (age 24)|6|Grasshoppers|
|Roger Wehrli|MF|March 18, 1956 (age 26)|6|Grasshoppers|
|Lucien Favre|MF|November 2, 1957 (age 24)|5 (1 as sub)|Toulouse  Servette|
|Alfred Scheiwiler|MF|February 4, 1956 (age 26)|1|Lausanne|
|Erni Maissen|MF|January 1, 1958 (age 24)|1 (as sub)|FC Zürich  FC Basel|
|Michel Decastel|MF|October 22, 1955 (age 26)|3|Servette|
|Ruedi Elsener|MF|February 18, 1953 (age 29)|4||
|Umberto Barberis|MF|June 5, 1952 (age 30)|3 (1 as sub)|AS Monaco  Servette|
|Andre Ladner|MF|May 20, 1962 (age 20)|1|Grasshoppers|
|Jean-Paul Brigger|ST|December 14, 1957 (age 24)|2 (1 as sub)|Servette|
|Hans-Peter Zwicker|ST|April 7, 1960 (age 22)|2 (both as sub)|FC Zürich  Lausanne|
|Claudio Sulser|ST|October 8, 1955 (age 26)|5|Grasshoppers|
|Beat Sutter|ST|December 12, 1962 (age 19)|2 (1 as sub)|FC Basel|
|Raimondo Ponte|ST|April 4, 1955 (age 27)|4|Grasshoppers|
|Manfred Braschler|ST|October 8, 1958 (age 23)|2|FC St. Gallen|

Question: what was the average age of the grasshoppers?
Answer: 24